Electric arc lamp



(No Model.) 4 Sheets-Sheet 2.

S. F. VAN GHOATE.

ELECTRIC ARG LAMP.

110. 302,061. Patented Ju1y 15, 1884.

N. versn mum-umnnpnw. wnhlngmn. o. e

(No Model.) 4 Sheets-Sheet 3.

' S. F. VAN GHOATE.

ELEG'TMC ARC LAMP.

,I Patented July l5, 1884.

5m @km J..

Hammam. wnmmm D. c4

(No Model.) 4 sheetssheet 4.

S. F. VAN OHOATE.

ELECTRIC ARG LAMP.

No. 302,061. PatentedJuly 15, 1884.,

www@ www UNiTEDf STATES PATENT sILvANUs n. vnN cI-ronrn, or New Yoan, N. Y.

ELECTRlC-ARC LAMP..

SPECIFICATION forming part Of LBttelS Patent NO. 302,061, dated July l5, 1884.

'F5 Application filed June 12, 1882. (No model.)

To all whom it may concern:

Be it known that I, SILvANUs F. VAN Cnonrn, a citizen of the United States, and a resident of New York, in the county of New York and State of New York, have invented certain new and useful Improvements in Electric Lamps, of which the following is a speci` fication.

The objects of my invention are to produce an electric lamp that will give a more steady y light than any similar arc light, and with less expenditure in electrical energy, and at the same time susceptible of being formed with a higher artistic appearance, and also free from many of the serious defects of other are lamps. I attain these objects by introducing several new'features, among which may be mentioned the following: iirst, the introduction and pe culiar arrangement and combination of two distinct automatic feed movements in regulating the carbons, one of which I call the abnormal 'feed77 and the. other the( micrometerfeed, 7 the former acting automatically without magnetic influences, and the latter acting under the restraint of magnetic action; second, the

peculiar arrangement of magnets, coils, and

circuits by which a very low resistance in the lamp to the action of the electric current is attained; and, finally, the peculiar arrangement of the reflectors, globes, supports, and

' casings, by means of which more pleasing and artistic effects are attainable.

In the accompanying drawings, Figure l' is a vertical central section ofthe working mechanism of the lamp on the line m x of Fig. 2. Fig. 2 is a top view of the same, the part on the line y y, Fig. l, being shown in section, and shows the relative position upon the insulated plate supporting the lamp mechanism of the posts supporting the various parts. Fig. 3 is a vertical central section of the workl ing parts 'of the lamp, taken on the line yy of Fig. 2 at right angles to the section, Fig. l. Fig. 4 is a horizontal section on the line y y, Fig. 3. Fig. 5 is a plan view of the main armature, looking at the saine from beneath, and shows the stopgcatch. Fig. 6 is a diagram of the connections and circuits'in the lamp. Fig. 7 is a vertical central section of a casing for the working parts of the lamp, and shows the manner of supporting the plate or table which carries the la'lnp proper. Fig. 8 is an elevation of the complete lamp, showing the globe,'reilector, casing, and supportingarm. Fig. 9 is a vertical central section illustrating a modified construction kof the supporting-arm, the tube carried thereby, andv the devices for making electrical connections between the main -line conductors and the lamp. Fig. I() is a detail View.

A, Figs. l, 2, 3, 4, and 7, represents a supporting plate or disk for the operative mechanism of the lamp, preferably of an insulating material, and hung, by means of rods B B, Figs. 2 and 7, from the interior of the cappiece or hood C, in the manner clearly'shown in Fig. 7.

D D. Figs. 2 and 3, are standards rising from the plate VA, and connected at their top by a cross-piece, a, Figs. I, 2, and L3, from which latter the spool of the regulating electromagnet of the lamp is supported.

E represents the spool, upon which are Wound the usual coil or coils, connected in the ordinary manner with the general circuits supplying current to the lamp, which spool is of iron or similar magnetic material, and' is provided with a pole-piece, b, clamped to its upper head, and extending downward into line with its lower head, so as to forni, in effect, a horseshoe -magnet, both poles of which act upon the armature c, by which the feed mech anism is actuated or controlled.

The extension b may be formed or -cast in one piece with the spool, if so desired. D', Fig. l, indicates a supporting and adjusting screw mounted in the cross-piece a, for supporting and adjusting the spool or regulating magnet E by means of a screw-thread on its lower end, said spool being prevented from turning, and being also guided, by a pin, d, projecting upward from the plate A through the armature into a perforation in the lower spoolhead.

The centerof the spool or magnet E is made in the form of a hollow cylinder, as indicated, to forma path for the carbon-carrier F, and a metallic sleeve, e, preferably vof brass, iitted nicely to said carrier, so as to make good con- IOO c is guided at its two extremities by rings or washers ff, preferably of steel,which are fixed one in sleeve of insulating material g, mounted in the cross-piece a, and the other in an insulatingsleeve,g, supported by a flange formed upon the interior of a short tube, G, which latter is supported beneath the plate Aby means of screws, which enter a flange at the top of the tube in the manner indicated.

At 7L is indicated a blade-spring fixed at one end to astud projecting upward from the plate A, and bearing at its free end upon the 'upper side of an insulated pin, k, projecting from the side of the tube e, so as to tend constantly to force the latter downward with a force sufficient to remove the knuckle-joint levers R R from contact with the carrier, as well as to move the armature and carrier F downward promptly. rlhis device is shown in detail in Fig. l0.

Fixed to the tube, so as to move with it or to carry itupward against the action of the spring when attracted by the regulating-mag net, is the armature c of the regulating electro-magnet, inoron which armature is pvoted a spring-actuated friction clutch or dog, II, here shown as in the form of a bell-cranlc lever, although other forms might be employed. One arm of said lever is rounded at its end, where it forms a friction toe or clamp bearing against the side of the carboi'i-earrier, while its other end is acted upon by a coiled spring, which is held in a tube mounted upon the armature, and tends to hold the friction-toe in engagement with the carrier with a force regulated by an adjustable cap, m, secured upon the upper end of the tube containing` the spring. rIhe amount of friction is to be adj usted to such a degree that the carrier will be held from feeding, and when the tube and the connected armature move downward the carrier will be moved downward by a positive action, but that the toe can slide over the surface of the carrier when the latter is held from upward movement, and said toe and its actuating-armature are lifted by the attraction of the regulating electro-magnet.

K is an adjustable stop for the armature,l which stop may be adjusted to determine the length of aro that shall be formed when the lamp begins to act, as will be presently more clearly seen, while K is a second adjustable stop adjusted slightly above the line of the stop K, and immediately beneath the horizontal arm ofthe friction-clutch II, so that if the armature and the connected clutch drop to a sufficient distance to bring the horizontal arm into engagement with the stop the friction-toe will be removed from engagement with the carrier, which will then drop freely. The latter` stop I term the abnormal feed-stop or releasing device, which in the normal operation of the lamp does not come into action, the operation of feeding the carrier to compensate for combustion of the carbon being brought about by scribed, which stop I term the auxiliary or micrometer stop, and which is applied se as to prevent the armature from dropping back to a point where the friction-clutch will be released. The latter step is under the control of any suitable electro-magnet ener gized from the lighting-circuit. In the pres ent instance,for the purpose of simplification, I employ the regulating electro-magnet ofthe lamp for this purpose. Said slop, when set in position, allows only a very small range of movement of the arn'laturc, which, by the means of devices to be presently described, results in the production of what term the micrometer feed.

The auxiliary or micometer stop is shown at Il, Figs. 3, 4, and 5, attached to or formed upon the end of an armature-lever, O, which is pivoted between ears formed upon the cross-piece a, and which bridges and attracted by beth spool-heads, forming an armature or keeper across both heads. To the ar' mature L is applied a retracti11g-spring, e, Fig. 3, or equivalent retracting device, which, when. the attraction ceases or becomes sulli eiently weakened, withdraws the stop out of range of the ar1natu1 'e-lever, and allows the latter to drop back siiiiiciently to release the friction-toe lf. The tension ofthe retractor o is, however, so slight that during the ordinary operation ofthe lamp it cannot overcome the attraction of the magnet. If, however, the attraction be diminished by extinction of the are, or by the formation of an abnormally long are, the retraetor will act, withdrawing the stop and completely releasing the carboncarrier by removing the operative portion of the friction holding and feeding device-viz., the friction-toe II.

It R represent two cluteh-levers pivoted in ears fbrmed upon the tube G, and pressed into engagement with the carbon-carrier F bylight springs s, or equivalent device. The function of these levers or dogs is to prevent the carrier from being lifted during the upward movement of the tube and the clutch I-I, their operation in this respect being due to the fact that the dogs impinge against the carrier on a line below their pivotal line of support, so that when the carrier begins to move upward the levers or dogs are caused to bind against it and stop its movement under the lifting action of the friction-clutch II, the latter then sliding en the surface of the rod. rIhe carrier may, however, move downward freely between them, as when moving in this direction it tends to separate the levers. rlhe carrier may, however, be moved upward at any time by hand by the exertion of a sufficient force to overcome the set pressm'e ofthe two dogs and the clutch Il", since the former are prevented from knueliling beyond a certain degree by the shoulders i', which come down close to the upper edges of the'dogs. The tube c extends downward to a point where, when the armature supporting it is .fully released bythe mag- I (JO IIO het, said tube will come into contact with the dogs and hold them out of engagement with the carbon-carrier. It is obvious that one dog only might be made to effect the purpose of the two. The employment of two is, however, preferable.

The plate A is made of insulating material, in order to insulate the lower carbon and its supports from the upper carbon and the lamp mechanism, the clutches bearing on the carbon-earrier and such other portions as are in electrical connection with the upper carbon.

The operation is as follows: NVhen no current is passing and the magnet or magnets are not energized, the auxiliary or micrometer feed-stop L is withdrawn out of range of the armature by its retractor 0, and the armature c rests against the abnormal feed-stops K K', the latter of which withdraws the friction lifting and impelling clutch H, so that the carbon-carrier is free to drop and bring the up per carbon into contact with the lower. In this position of the parts the tube e holds the dogs R out of engagement with the carrier,the distance to which they are removed `being determined by the adjustment of the stops K K. Vhen the current passes through the magnets of the lamp, the armature c is lifted, the first effect being to allow the clutch Hte engage with the carrier and raise it, the dogs R being kept out of engagement with the carrier by the tube e until an arc of the proper length has been formed. rlhe tube e then leavesthe dogs, which come into engagement with the carrier and prevent further upward movement thereof, so that during the remaining upward movement of the armature the clutch AH slips upon the carrier, The time at which the dogs shall be allowed to engage with the carrier, and the consequent length of the are, is determined by the adjustment of the stops K K', as above stated. The armature c is drawn upward against the poles of the magnet, but is prevented from sticking by means of a facing of copper, mica, or other noirmagnetic materiahapplied to the poles or to the armature. Sin'iultaneously with the attraction of the armature .c the auX- iliary or micrometer feedstop L is operated by the armature O, and is set beneath the armature c, so that its downward movements are limited thereby, and the clutch H cannot be disengaged. The armature now plays between the poles of the magnet and the auxiliary stop and produces the micrometer feed in the following manner, the extent of its movements and the iineness of the feedvbeing graduated by the adjustment of the magnet by means ofthe supporting-screw D: Vhen, owing to consumption of the carbons, the strength of the magnet decreases, the tube c and connected armature c are carried downward by gravity and by the action of the spring h, and the carrier is fed downward by the action of the friction-clutch H, its movement not being opposed by the dogs R. YVhen, owing tothe resultant increased attraction ofthe magnet, the armature is immediately raised again, the carrier is prevented from rising with it by the action ot' the dogs It, which lock it from upward movement, and the. clutch H then takes a new position on the carrier, ready for the next downward feed, f

In the micrometcrfeed movement the tube e does not drop far enough to come into contact with or operate the dogs Ri If from any cause the attraction of the magnet diminishes so far that the auxiliary stop L is withdrawn, the armature then recedes so as to come into contact with the stops K K, whereupon the carrier is released entirely and drops until the carbons come into contact, as before described. If the lamp be incondition to resume its operation, the armature is immediately attracted again, the are formed, and the micrometer yfeeding action again comes into play, or the carbons remain in contact, if the release has been produced by switching the current froln the lamp, until the magnet is energized by turning on the current again.

In addition to the feed-regulating armature c and the auxiliary-stop armature O, I apply to the electro -magnet E, in a similar way to armature O, another armature, M, which serves to complete a cut-out or safety circuit around the lamp when the are is extinguished or becomes abnormally lengthened. rIlhis armature, like armature O, forms a keeper across the two -heads of magnet E, and ispivoted from the cross-plate a, as shown. One branch of the safety-circuit wire is indicated, at m', as atttached to a blade-spring, n, projecting from and soldered into the end of the armature and serving as a retractor for the armature, and a means of conveying the current thereto without passing through the pivots by which it is supported. rlhe other branch of the safetycircuit is connected to an adjustable spring contact-stop, p, mounted upon plate A, and adjustable by a set-screw passing through a post, D. A contact upon the end of armaturelever M serves to complete the circuit. rlhe tension of the spring n is adjusted by a set-` screw passing through an extension from top of post D. Other means for retracting the armature might be employed.`

It is evident that the armature O might be utilized for closing the eut-out circuit and the armature M dispensed with. I prefer, however, to employ the two armatures, as it is desirable to set the retractor of the armature O so that it will act with a less degreeof diminution in the strength ot' t-he magnet than will the armature M.

In order to attain as low a resistance to the electric current as possible in the lamp-magnets, and to enable me to make the magnet of small dimensions, I form around the magnet E a branch circuit embraein g a bobbin of wire wound upon a spool, W', preferably of insulating material, Fig. 7, the resistance of which bobbin is sufficient only to divert the necessary portion of the current into the electromagnet E for energizing` the same. As the current ilows in multiple arc the resistance is lessened over what it would be if all of the current were compelled to pass through the regulating electro-magnet. The liability of the latter to injury by heating from the elec' tric current is also avoided.

The spool \V is iixed in the top ofthe cappiece C in any suitable manner, and is made hollow to i'orm a passage for the carbon-carrier F and a support for au auxiliary tube, A, which serves to protect the carrier F from beingjannned or interfered with by the conductingwires, which pass down to the lamp through the space between said tube and the outer tube, 4t, which latter supports the whole lamp structure. Electrical connection with the carrier is made through its encircling iube e,whieh latter carries a metallic collane,

at its upper end, to which the positive main conductor l.) is screwed or clamped by any suitable means.

At 17 is shown an insulated contact supported in a collar at the top of the tube e, with which contact a collar, 1S, upon the carrier comes into connection for thepurpose of closing anelectric circuit to a mechanism which will change the circuit to anotherlamp.

The remaining electrical connections of the various parts are made in the ordinary way, and the paths ol" the currents when the parts are connected up are clearly indicated by the diagram, Fig. (3, where the parts already rev I'erred to are designated bythe same letters, l) representing the positive main conductor, and N the negative. A resistance, Q, is inserted, when desired, in the cut-out or safety circuit, as indicated, so that the resisti'mce of said circuit when closed shall be approximatelyequal to that oli' the circuit through the arc.

ltelerring to Figs. 7, S, and 9, the protecting-casing i'orthe lamp is indicated bythe ligure 1,sai d casing being secured by screws, as iudicated, or by other means, to the cap-piece C. To the lower end ol" the casing lis secured the rellector 2, which may be made in one piece with the tube, il' desired, and of tin or any other material. rlhe cap-piece is sustained from a bracket, 5, by a tube, 4f, which screws into the top of the cap-piece C, and is embraced by a ring or collar attached to the end ol" the bracket. rllhe rods which support the lower carbon, 'and are indicated at 3 3, extend downward from the plate A within the inclosing-globe 6, and at their bottom are connected by the cross-piece by which the lower carbon is supported. In case of a doul'ile-ez'trbon lamp there would be but one rod in the center, carrying at its lower end a cross-head, on either end of which the two carbons would be supported. ln either case the :rod or rods and the cross-piece at points below the arc are entirely free from any attachments whatever, and hu ug suspended and entirely disconnected from the globe or any other supporting devices. These rods are fixed to the plate A,and

are shown in Figs. 2 and 7 as l'n'ojecting up through the plate and fastened by nuts or screws.

The globe 6, solid or continuous at its bottom, is inverted, and its ring or holder 7 supported by arms provided at their ends with links S, which hook onto proiections secured to the rods By detaching the links 8 the globe may be lowered to the position indicated in dotted lines, so as to allow access to the lamp for renewal of the cai-bons. The upper ends of the supporting-arms ior the globe-holder are formed into guide sleeves or tubes 9 9, which slide freely up and down upon the rods 8 3, and catch upon the crosssupport, so as to support the globe when it lowered for renewing the carbons, or l'or any other purpose. By constructing the globe so that it is continuous at its bottom, as shown, and bysupporting it in the manner described, more pleasing ell'ects are attained, and no shadows are produced, either to the sides o l' o r below the light, by the supporting and holding parts for the globe.

The positive and negative conductors are carried down through the tribe 4; from binding-posts mounted on insulating material 11.1, fixed on the inside of a bonnet or hood, 10, which is supported by posts '1.2, rising l'rom the tube 4.

Fig. 9 shows a construction in which thecolt ducting-wires arcbrought to the lamp through the hollow bracket 5, instead ol" through the top ot' the tube 4L. A block olr insulating material, 13, is iixed in the interior oll the tubel 4, at a point Ijust below the opening ol' the hollow bracket, and carries the binding-posts by which the electrical connections are made. An opening is i'ormed in the side ol? the tube 4L to match with the opening ol" the bracket, and the tube itself is screwed into a sleeve l'oriued on the end of' the bracket, or is fastened in any other suitable manner. A cap, 11.4, screws upon and closes the upper end et' the tube 4L.

The arrangements of Figs. S and l) are intended, mainly, for application to lamps de. signed for outdoor use. \Vhen the lamps are used indoors, the tube 4L may extend up and be fastened to the ceiling and the wires earried oft' through the tube, the bracket 5 being dispensed with.

lt is obviously within the scope of my in yention to control the armature-lever t), which operates the auxiliary stop, by an, ad ditional electro-magnet, instead ot' by the elecY tro-magnet which controls the 4l'ecd devices. The arrangement shown is, however, preterable on account of its coinpactness. l may use other constructions and i'orms ol' electro-magnet in place of the magnet lil. @ther modili cations will readily suggest themselves to those skilled in the art.

rlhe electro-magnet E maybe wound :in any of the ways known in the art-either with wire in the main circuit only or differentially. I

ICO

' do not limit myself to controlling the auxiliary or micrometer feed stop by the agency of magnetism, as it is obvious .that it may be operated by other means besides magnetic means, my invention consisting in the combination, with the armature which controls or operates the feed-regulating devices, of two stops or sets of stops, one of which is applied by any means to limit the movement of the armature during the normal operation of the lamp in feeding, but is withdrawn to allow the armature to recede sufficiently to come into contact with the other set when the arc is extinguished or becomes abnormally lengthened.

.In another application for patent,led as a division of this application, l show and claim the f ollowing` combinations, to wit:

The combination of the armature, the carrier-tube to which the armature is iixe'd, the magnetic spool-head, the friction lifting and impelling clutch pivoted in the armature, and the fixed stop for releasing the clutch.

The combination, with the carrier F, of a pivoted clutch or dog, R, having a rounded head, and applied, in the manner described, to arrest the upward movement of the carrier, and means for checking the movement of said clutch, so as to allow the carrier to be forced up by hand.

In combination with an electric lamp, one or more pivoted dogs oscillating` on stationary centers or bearings, and having one end resting against the carbon or carbon-carrier, and acting to prevent the carbon or carbon-carrier from moving upward when the feed-armature rises.

In combination with an electric lamp, one or more pivoted dogs uniniiuenced or acted on by anymagnet, but oscillating on stationary centers or bearings, and operated in the manner described, said dogs having rounded ends, and being arranged so as to allow the carbon or carrier to be moved up and down by hand, notwithstanding the wedging or clamping tendency of said dog or dogs while the armature is attracted by its magnet.

The insulating-plate A, in combination with the rod or rods B B, and the cap-piece, substantially as described.

The combination ofinsulating-plate A, the inclosing case or tube I, and the cap G, for the purpose described.

In an electric lam'p,'an adjustable magnet combined with the feed mechanism, in the manner described, to determine the exact dis.- tance to which the carbon or carrier shall be fed at each operationof the magnets armature.

The combination, with the magnetic spool E, ofthe safety cut-out armature M, bridging the spool-heads.

The combination, with the supporting cross-piece a, of the hollow magnet-spool E and the armatures O M, hung from the crosspiece and bridging the spool-heads.7

4lengthened.

l do not wish to be understood as making claim herein to the above-specified combinations.

What l claim as my invention is l. The combination, with the feed-regulating 'armature for an electric lamp, of a stop or catch for limiting the movement of said armature in the operation of controlling the feed, and means for bringing said stop or catch into operative position after the armature has been attracted by its magnet.

2. The combination, with the feed-regulating armature of an electric lamp, of an auxiliary armature for limiting or shortening the movement of the former, whereby a limited play of the armature in producing a'feed shall be allowed, and whereby said armature may be permitted to fall back upon its more -remote stop when the current actuating the magnet becomes so weak that the magnets power is not suiiicient to hold the auxiliary armature in position to limit the movement of the feedregulating armature.

3. The combination, with the feed-regulating armature for an electric lamp, of a lifting and feeding clutch, a releasing-stop, and an auxiliary stop and armature, arranged in the manner described, for limiting the movement of the feed-regulating armature during the normal feed, and preventing contact of the lifting-clutch with its releasing-stop.

4. The combination, with the feed-regulating armature of an electric lamp, of an auxiliary armature for limiting the reverse movement of the former after it has been attractedby the magnet, a stop operated by said micrometer-feed armature, and set thereby beneath or in range of the feed-regulating armature, and a retracting device adjusted below the strength of the normal current for withdrawing the said micrometer-feed armature when the are is extinguished or abnormally 5. The combination of an armature, a pivoted spring-actuated clutch engaging with the carbon-carrier, a releasing-stop for said clutch, and an auxiliary armature or stop controlled by the action of an electro-magnet, and arranged in the manner described, to confine the movements of the main or feed armature within a range in which the clutch will not come into contact with its releasing-stop.

6. The combination of the armature c, fixed to and moving with the carrier-tube, the elbowlever-clutch H, pivoted in the armature, and a pressure-spring mounted in the armature and bearing against one arm of the lever.

7 The combination, with the armature and the friction clutch carried thereby, of two stops, K K', one of which is set to operate the clutch for releasing the carrier before the movement of the armature is stopped by the other.

8. rllhe combination, with the armature and the clutch, of two adjustable stops-one ar- IOO IIO

ranged to arrest the movement of the armature and the other to release the carbon-carrier.

9. The combination, with the armature and the friction-clutch carried thereby, of a lccl ing clutch or clutches controlled by the armature for stopping the upward movement of the carrier, and two adjustable stops.

l0. The combination, with the armature, the locking clutch or clutches, and the frictionclutch, of two adjustable stops-one arranged to arrest the movement ci' the armature and the other to release the carbon-carrier.

ll. The combination, with the carrier, et' two pivoted dogs or clutches arranged to ai rest the upward movement of the carrier, and a carrier-tube connected to the armature i'or holding said levers away from the carrier du ring formation ofthe arc.

l2. rlhe combination of a carrier, F, a friction iinpelling and lifting clutch pivoted on the armature, and adapted to slide in either direction upon the carrier, and the springactuated locking dogs or levers, applied to the carrier in the manner described, tc arrest the upward movement thereof.

13. The combination ol'a carrier, F, a friction impelling and lifting clutch pivotcd on the armature, a locking or 'clutch lever or lcvers applied to the carrier in the manner described, and a device fastened to and moving with the armature and. clutch, and acting to hold the knuckle-joint lever or levers or dogs out of engagement with the carrier to allow the formation ofthe arc.

LL. rlhe combinati on of the carrier F, a friction impelling and lifting clutch, a locking or clutch lever or levers for arresting the upward movements of the carrier, and the carrier-tube c, acting upon the knucklejoint levers or dogs to hold them out of engagement with the can rier during formation of the arc.

l5. The combination of the carrier-tube c, the clutches or dogs applied to the carbon-car rier, and the spring 71, applied to the carriertnbe and acting to remove the dogs irom engagement with the carbon-carrier.

1G. rlhe combination, with the armature c, of an impelling-clutcli carried therebyv and engaging with the carbon carrier, a backstop for said armature, an actuating` electromagnet acting as the i'ront stop, and means :for

adjusting the magnet to govern the length el' feed at each movement ol" Vthe armature.

17. The combination, with the magnet E, el' the armature c, vibrating between a stop and said magnctpole, the carrier-tube (l, and means for adjusting the magnet for determining the reverse movement ot' the carriei 'tul ie.

18. In an electric lamp, magnet E, coinposed ofa hollow spool of iron provided with an extension, Y), magnetically connected to one head et' the spool and carried down into line with the other head, and a l'eed-regulatingar mature for adjusting the carbons.

lf). The combination, with the magnetic spool lil, of the armature-lever O, bridging the spool-heads and carrying the auxiliary or micrometer -i'eed stop.

20. The combination ol' the magnet lil, provided with an extension, b, connected to one spool-head, an armature, e, VI'or operating the l'eed mechanism, actuated by said magnet and extension b, and a supplemental eut-out armature bridging the spoollieads.

2l.. In an electric lamp, a magnet, lil, p1'c vided with three armatures, one el' which acts to form the arc, and is attracted by one direct pole, and an extension, b, 'l'rom the other, and the other two oi' which are supplemental ar matures bridging the spootheads, cnc el' said latter armatures Operating a n1ic1'omete1.'-lced stop, and the other controlling the automatic cut-Out.

-22. The combination, with the cari-ici.' F, ol' the protectii'ig-tube A', jjilaeed between. the carrier and the external supportiligtube, 1L, and the conducting-wires` j iassing down within the space between the tubes.

23. rlhe combination, with the magneti, ol" the auxiliary spool or wire NV, the terminals of which are connected with the terminals of the magnet E, said spool being arranged and constructed, as and i'or the j iurpose described, to lowerthe resistance and io permit the magnet to be made of small dimensions without danger of in j ary by heating.

Signed at New York, in the countjr oi.' New York and State of New York, this 0th day ol' June, A. D. 1882.

SIL'VAN'US F. TAN CllUAflllD.

Vi tnesscs:

Il. G. TowNsnNn, Tiros. loonni'. 

